Space-Ray LTU Operating instructions

Brand: Space-Ray

Model: LTU

Type: Operating instructions

Form #43155010

Mar 2023

INSTALLATION AND OPERATION INSTRUCTIONS

OWNER / INSTALLER: For your safety this manual must be carefully and thoroughly read and

understood before installing, operating or servicing this heater.

INFRARED RADIANT TUBE HEATER

Single and Two Stage Pull Through System (Negative Pressure)

Models:

LTU SERIES:

(80, 90, 100, 110, 120, 125, 130, 140, 150, 160,

175, 180, 200, 225, 250) – N5/L5/N7/L7

LTS SERIES:

(40, 50, 60, 75, 80, 90, 100, 110, 120, 125, 130, 140, 150,

150, 160, 175, 180, 200, 225, 250) - N5/L5/N7/L7

!INSTALLER: This manual is the property of the owner. Please present this manual to the

owner when you leave the job site.

▲WARNING: Improper installation, adjustment, alteration, service, or maintenance can

cause property damage, injury or death. Read the installation, operation and maintenance

instructions thoroughly before installing or servicing this equipment.

IF YOU SMELL GAS:

FOR YOUR SAFETY

! DO NOT try to light any appliance.

! DO NOT touch any electrical switch; DO NOT use any

telephone in your building.

! IMMEDIATELY call your gas supplier from a neighbor's

telephone. Follow the gas supplier's instructions. If you

cannot reach your gas supplier, call the fire department.

DO NOT store or use gasoline or other

flammable vapors and liquids in the vicinity of

this or any other appliance.

!IMPORTANT: SAVE THIS MANUAL FOR FUTURE REFERENCE.

SPACE-RAY

Post Office Box 36485 (28236) • 1700 Parker Drive (28208) • Charlotte, North Carolina

Phone (704) 372-6391 • Fax (704) 332-5843 • www.spaceray.com • email: in[email protected]om

Scan warranty QR code on the right to

 
TABLE OF CONTENTS 
 
SECTION  DESCRIPTION  PAGE 
0) Safety ................................................................................................................................................... 1 
0) Installer Responsibility ...................................................................................................................... 1 
0) General Information ........................................................................................................................... 1 
0) Minimum Clearances to Combustibles ........................................................................................... 3 
0) Typical Suspension Methods ............................................................................................................ 4 
0) LTU Series Specifications .................................................................................................................. 5 
0) LTU Series Packing List ..................................................................................................................... 6 
0) LTU Series Typical Layouts ................................................................................................................ 8 
1) LTU Series Dimensions ...................................................................................................................... 8 
2) LTU 80-175 Series Heater Assembly Overview ........................................................................... 10 
3) LTU 180-250 Series Heater Assembly Overview ......................................................................... 11 
4) LTU Series 15’ Body Package Opening ......................................................................................... 11 
5) LTU 80-130 Series Heater Assembly ............................................................................................ 12 
6) LTU 125-250 Series – Joining of 5’ and 10’ Body Sections ...................................................... 15 
0) LTS Series Specifications ................................................................................................................ 16 
0) LTS Series Packing List ................................................................................................................... 17 
0) LTS Series Typical Layouts .............................................................................................................. 20 
1) LTS Series Dimensions .................................................................................................................... 21 
2) LTS 40-175 Series Heater Assembly Overview ........................................................................... 22 
3) LTS 180-250 Series Heater Assembly Overview ......................................................................... 23 
4) LTS Series Heater Assembly ........................................................................................................... 23 
5) LTS Series - Adding Optional 90º Elbow ....................................................................................... 27 
6) LTS Series - Adding Optional Corner Reflector ............................................................................ 27 
7) LTS Series - Attaching Control Box Assembly .............................................................................. 27 
8) LTS Series - Attaching Draft Inducer Assembly ........................................................................... 28 
9) LTS Series - Inclined Mounting Instructions ................................................................................. 29 
0) Accessory Packages ........................................................................................................................ 31 
0) Multiple Hanging & Draft Inducer Positions ................................................................................ 31 
0) Gas Connections and Regulations ................................................................................................. 33 
0) Instructions for Pressure Test Gauge Connection ....................................................................... 35 
0) Electrical Connections ..................................................................................................................... 36 
1 Single Stage (N5/L5) – Internal And Thermostat Connections ................................................ 37 
2 Two Stage (N7/L7) – Internal And Thermostat Connections .................................................... 39 
0) Venting ............................................................................................................................................... 43 
0) Air for Combustion ........................................................................................................................... 47 
1) Direct Outside Air for Combustion ................................................................................................. 47 
0) Lighting and Shutdown Instructions .............................................................................................. 49 
0) Sequence of Operation – Single stage (N5/L5) .......................................................................... 49 
1) Sequence of Operation – Two stage (N7/L7) .............................................................................. 50 
0) Cleaning and Annual Maintenance ............................................................................................... 51 
0) Troubleshooting Guide – Single stage (N5/L5) ........................................................................... 52 
1) Troubleshooting Guide – Two stage (N7/L7) ............................................................................... 55 
0) Replacing Parts ................................................................................................................................ 59 
1) Removing Spark Electrode ............................................................................................................. 59 
2) Removing Main Burner and Gas Valve ......................................................................................... 59 
3) Air Switch Pressure Check .............................................................................................................. 60 
4) Ignition System Checks ................................................................................................................... 60 
5) Motor and Blower Wheel Check ..................................................................................................... 61 
0) Installation Data ............................................................................................................................... 62 
0) Replacement Parts Guide ............................................................................................................... 63 
0) Warnings Card .................................................................................................................................. 69 
 
 
This  heater complies  with ANSI  Z83.20  (current standard)  and CSA  2.34.  Copies of  the National  Fuel  Gas  Code  (ANSI 
Z223.1-latest edition) are available from the CSA at 8501 East Pleasant Valley Road, Cleveland, Ohio 44131 or 55 Scarsdale 
Road, Don Mills, Ontario M3B 2R3. All NFPA codes are available from the National Fire Protection Association, Batterymarch 
Park, Quincy, Massachusetts 02269. 

-1-

1.0) SAFETY

This heater is a self-contained infrared radiant tube heater. Safety information required during installation and

operation of this heater is provided in this manual and the labels on the product. The installation, service and

maintenance of this heater must be performed by a contractor qualified in the installation and service of gas

fired heating equipment.

All personnel in contact with the heater must read and understand all safety information, instructions and labels

before operation. The following symbols will be used in this manual to indicate important safety information.

Warning instructions must be followed to prevent or avoid hazards which

may cause serious injury, property damage or death.

Caution instructions must be followed to prevent incorrect operation or

installation of the heater which may cause minor injury or property

damage.

2.0) INSTALLER RESPONSIBILITY

The installer is responsible for the following:

• The heater and venting, as well as electrical and gas supplies must be installed in accordance with these

installation instructions and any applicable codes and regulations.

• Every heater shall be located with respect to building construction and other equipment so as to permit

access to the heater.

• Each installer must follow the clearances to combustible materials for the heaters.

• Install the heater so that the supports and hangers are correctly spaced in accordance with these

instructions. The heater must be supported by materials having a working load limit of at least 115lbs.

• Supply the owner with a copy of these Installation and Operation Instructions.

• Where unvented heaters are used, gravity or mechanical means shall be provided to supply and exhaust at

least 4 CFM per 1,000 Btu/hr input of installed heaters.

• Never use the heater as a support for a ladder or other access equipment. Do not hang anything from the

heater.

• Supply all installation materials necessary that are not included with the heater.

• Check the nameplate to make sure that the burner is correct for the gas type in the building and the

installation altitude.

3.0) GENERAL INFORMATION

This heater is a self-contained infrared radiant tube heater for use in locations where flammable gases or vapors

are not generally present (as defined by OSHA acceptable limits) and is intended for the heating of

nonresidential spaces.

INSTALLATION REQUIREMENTS

The installation must conform to local building codes or in the absence of local codes, with the National Fuel Gas

Code ANSI Z223.1/NFPA54 or the Natural Gas and Propane Installation Code CSA B149.1. Heaters shall be

installed by a licensed contractor or licensed installer. Clearances to combustibles as outlined in this manual

should always be observed. In areas used for storage of combustible materials where they may be stacked

below the heater, NFPA54 requires that the installer must post signs that will “specify the maximum permissible

stacking height to maintain the required clearances from the heater to combustibles.”

The higher capacity LTS/LTU 180–250 models generate intense radiant heat. Therefore, the minimum

recommended mounting height is 18 ft. above floor level for the LTS/LTU 180-200 models and 20 ft. above floor

level for the LTS/LTU 225-250 models. Heaters may be mounted at various heights and angles depending on

the application. If you have any questions, please consult your local Space-Ray representative.

Every heater shall be located with respect to building construction and other equipment so as to permit access

to the heater. Each installer shall use quality installation practices when locating the heater and must give

consideration to clearances to combustible materials, vehicles parked below, lights, overhead doors, storage

areas with stacked materials, sprinkler heads, gas and electrical lines and any other possible obstructions or

hazards. Consideration also must be given to service accessibility.

-2-

The heater, when installed in aircraft hangars and public garages, must be installed in accordance with

ANSI/NFPA 409-latest edition (Standard for Aircraft Hangars), ANSI/NFPA 88a-latest edition (Standard for

Parking Structures), and ANSI/NFPA 88b-latest edition (Standard for Repair Garages) with the following

clearances:

a. At least 10 feet above the upper surfaces of wings or engine enclosures of the highest aircraft that may be

housed in the hangar and at least 8 feet above the floor in shops, offices, and other sections of hangars

communicating with aircraft storage or service areas.

b. At least 8 feet above the floor in public garages. ▲WARNING: Minimum clearances marked on the heater

must be maintained from vehicles parked below the heater.

(FOR CANADA ONLY)

a. Installation of this appliance is to be in accordance with latest edition of CSA B149.1 (Natural Gas and

Propane Installation Code).

b. For installation in public garages or aircraft hangars, the minimum clearances from the bottom of the

infrared heater to the upper surface of the highest aircraft or vehicle shall be 50 percent greater than the

certified minimum clearance, but the clearance shall not be less than 8 feet.

Although these heaters may be used in many applications other than space heating (e.g., process heating),

Space-Ray will not recognize the warranty for any use other than space heating.

For indoor installation only. Not for use in residential dwellings.

This heater is for Indoor Installation and Covered Patio Installation only and can be used in either Vented or

Unvented mode. The term Unvented actually means Indirect Vented. While the products of combustion are

expelled into the building, national codes require ventilation in the building to dilute these products of

combustion. This ventilation may be provided by gravity or mechanical means.

This heater is not an explosion proof heater. Where the possibility of exposure to volatile and low flash point

materials exists, it could result in property damage or death. This heater must not be installed in a spray booth

where the heater can operate during the spraying process. Consult your local fire marshal or insurance company.

LTS Series Only: Since straight tube heaters are always hotter at the control end than at the flue terminal end,

always observe the minimum recommended mounting heights shown on the specification sheets in Section 8.6)

of this manual. Use U-tube configuration instead of straight tubes for spot or area heating (e.g., where a single

heater is utilized for space heating).

High Altitude:

Appliances are supplied as standard for altitudes of O to 2,000 feet (0-610 m). High-altitude ratings are obtained

by a change in the orifice size. When ordered for high altitude installations, burners are supplied by the factory

ready for high altitude installation. Check the nameplate for altitude before proceeding with the installation. In

Canada the adjustment for altitude is made in accordance with Standard CGA 2.17, Gas-Fired Appliances for Use

at High Altitudes.

This product can expose you to chemicals including ceramic fibers, which

are known to the State of California to cause cancer, and carbon monoxide,

which is known to the State of California to cause birth defects or other

reproductive harm. For more information go to www.p65warnings.ca.gov.

-3-

4.0) MINIMUM CLEARANCES TO COMBUSTIBLES

Follow the instructions packaged with the kit for installation. Install the warnings card (ordered separately) and

complete the blank spaces using the clearances from combustibles table below. See Section 27 for a printed

copy of the warnings card.

Minimum clearances to combustibles shall be measured from the outer surfaces as shown in the following

diagram:

MINIMUM CLEARANCES TO COMBUSTIBLES

Model No.

Mounted Horizontally

Angle Mounted at

45º

Sides

Ceiling*

Below

Ends

45º Front

45º Rear

LTS 40, 50

24”

6”

40”

15”

40”

12”

LTS 60, 75

24”

6”

60”

15”

52”

12”

LTS/LTU 80, 90

26”

6”

66”

15”

52”

12”

LTS/LTU 100

28”

6”

76” **

15”

60”

12”

LTS/LTU 110, 120, 125, 130

32”

6”

82” **

20”

66”

12”

LTS/LTU 140, 150

36”

6”

87” **

20”

70”

12”

LTS/LTU 160, 175

42”

6”

93” **

20”

77”

12”

LTS/LTU 180, 200

44”

6”

106” **

20”

84”

12”

LTS/LTU 225, 250

56”

6”

112” **

20”

90”

18”

* When used indirect vented, minimum clearance for CEILING must be: 12” for LTS 40-75 and 18” for LTS/LTU

80-250. If optional corner and U-bend reflectors are not used, the clearance must be 18”.

** Maximum clearance below reduces by 50% once you are 25 ft. downstream from the burner box.

▲WARNING: Certain materials or objects, when stored under the heater, will be subjected to radiant heat and

could be seriously damaged. Observe the Minimum Clearances to Combustibles listed in the manual and on the

heater at all times.

NOTE:

1. The clearances specified above must be maintained to combustibles and other materials that may be

damaged by temperatures 90ºF above ambient temperature. Clearances to combustibles are posted on the

control box. In areas used for storage of combustible materials where they may be stacked below the heater,

NFPA54 requires that the installer must post signs that will “specify the maximum permissible stacking height

to maintain the required clearances from the heater to combustibles.” Space-Ray recommends posting these

signs adjacent to the heater thermostat or other suitable location that will provide enhanced visibility.

2. The stated clearance to combustibles represents a surface temperature of 90 ºF (50 ºC) above room

temperature. Building materials with a low heat tolerance (such as plastics, vinyle siding, canvas, tri-ply, etc.)

may be subject to degradation at lower temperatures. It is the installer’s responsibility to assure that adjacent

materials are protected from degradation.

-4-

5.0) TYPICAL SUSPENSION METHODS

Various means of suspending the heater can be used. See the following drawings for typical examples.

1. Use only noncombustible materials for suspending hangers and brackets.

2. A minimum No. 2 chain with a working load limit of 115 lbs. is required.

3. Turnbuckles can be used with chains to allow leveling of the heater. All “S” hooks and eye bolts must be

manually crimped closed by the installer.

4. When using rigid means for heater suspension (rod, flat bar, etc.) provide sufficient lengths or swing joints to

compensate for expansion. See Figures b and c.

5. Heaters subject to vibration must be provided with vibration isolating hangers.

6. Heaters must not be supported by gas or electric supply lines and must be suspended from a permanent

structure with adequate load capacity.

Space-Ray recommends that the body sections be suspended using chains with turnbuckles. This will allow slight

adjustments after assembly and heater expansion/ contraction during operation.

If a “trapeze” method is used for tube support/hanger brackets (shown below), the minimum chain length for the

two connecting chains is 36” to minimize any vibration that might be generated by the draft inducer assembly. If

these chains must be less than 36”, then do not use the trapeze method and, instead, use individual chains on

each tube support/hanger bracket.

-5-

6.0) LTU SERIES SPECIFICATIONS

Model

No.

Btu/hr

High

Input

(2-Stage)

Btu/hr

Low

Input

Flue Restrictor

Plate

I.D. & Part #

Orifice Size

Minimum *

Mounting Height

Natural Gas

Propane Gas

Horizontal

45º Angle

LTU 80

80,000

50,500

1-1/2”

42741050

#19

(0.166)

#38

(0.102)

13 ft.

12 ft.

LTU 90

90,000

57,000

1-1/2”

42741050

#16

(0.177)

#36

(0.106)

13 ft.

12 ft.

LTU 100

100,000

63,000

1-5/8”

42741060

#14

(0.182)

#33

(0.113)

13 ft.

12 ft.

LTU 110

110,000

69,500

1-3/4”

42741070

#10

(0.194)

#31

(0.120)

14 ft.

13 ft.

LTU 120

120,000

76,000

1-3/4”

42741070

13/64

(0.203)

1/8

(0.125)

14 ft.

13 ft.

LTU 125

125,000

80,000

1-7/8”

42741080

(0.206)

#30

(0.129)

14 ft.

13 ft.

LTU 130

130,000

82,000

1-7/8”

42741080

(0.209)

3.3mm

(0.130)

14 ft.

13 ft.

LTU 140

140,000

88,500

2-1/32”

42741090

5.5mm

(0.216)

#29

(0.136)

15 ft.

14 ft.

LTU 150

150,000

95,000

2-1/32”

42741090

5.7mm

(0.224)

#28

(0.140)

15 ft.

14 ft.

LTU 160

160,000

100,000

2-1/4”

42741100

5.8mm

(0.228)

#27

(0.144)

15 ft.

14 ft.

LTU 175

175,000

110,000

2-1/4”

42741100

“C”

(0.242)

3.8mm

(0.150)

15 ft.

14 ft.

LTU 180

180,000

2-1/4”

42741100

“C”

(0.242)

#24

(0.152)

18 ft.

17 ft.

LTU 200

200,000

125,000

2-3/8”

42741130

“F”

(0.257)

#21

(0.159)

18 ft.

17 ft.

LTU 225

225,000

146,000

2-1/2”

42741140

6.9mm

(0.272)

#18

(0.170)

20 ft.

19 ft.

LTU 250

250,000

162,000

2-3/4”

42741150

“K”

(0.281)

4.5mm

(0.177)

20 ft.

19 ft.

* MOUNT HEATERS AS HIGH AS POSSIBLE. Minimums are shown as a guideline for human comfort and uniform

energy distribution for complete building heating applications. Consult your Space-Ray representative for the

particulars of your installation requirements.

Model Identification:

Control Option

Suffix

Gas Type

Description

Natural

Single Stage Gas Valve – Single Stage Input

Propane

Single Stage Gas Valve – Single Stage Input

Natural

Two Stage Gas Valve – Modulating Input – High/Low Fire

Propane

Two Stage Gas Valve – Modulating Input – High/Low Fire

Type

Gas

Gas Pipe

Connection1

Tube

Diameter

Flue

Connection2

Fresh Air

Connection

Electrical

Supply

Current

Rating

Natural

or Propane

½” MPT

(Male)

4”

4” Round

6” Round

120 Volt, 60Hz,

1 Phase

2.6 Amp

1 LTU 225 and 250 require a minimum 3/4” nominal ID flexible gas connector.

2 LTU 180-250: 6” round. See Section 17.0) for vent sizes and limitations.

Module Electrical Rating:

Ignition System (direct spark):

Fuse : 2 Amp 250V (for 24V Circuit) Input Power

Input-Control: 18-30VAC 60 Hz (class 2 transformer)

Flame Sensitivity: 0.7 uA (microamps) minimum

30 second pre-purge period

21 second trial for ignition period

Single trial for ignition (local sense)

-6-

7.0) LTU SERIES PACKING LIST

A. Control/Draft Inducer Package

Part Description QTY

Control Box Assembly .............................................................................................................................. 1

Draft Inducer & Junction Box Assembly ................................................................................................ 1

Flue Restrictor Plate (See Section 6.0) for plate I.D. and part no.) ................................................... 1

4” x 6” Starting Collar1 (#42892009) Supplied with LTU 180-250 ................................................. 1

Control Fastener Kit (#42907010) ....................................................................................................... 1

Containing: #8-32 Screws & Nuts (#02166010 & #02127030) .......................................... 2

¼ - 20 Locknuts (#02167010) .............................................................................. 6

Tube Flange Gasket (#42921000) ...................................................................................................... 2

Installation & Operation Instructions (#43155010) .......................................................................... 1

Gas connector, 5/8” OD x 36” (#30302360) 2 - US only ................................................................... 1

1 4-inch Starting Collar (#40504020) supplied with LTU 80-175 models.

2 LTU 225 and 250 models using Gas Connector, 1” OD x 36” (#30302361)

LTU 80-250 CONTROL/DRAFT INDUCER PACKAGE NUMBERS

1-STAGE CONTROLS

2-STAGE CONTROLS

MODEL NO.

PART NO.

GAS TYPE

MODEL NO.

PART NO.

GAS TYPE

LTU 80-N5

42883010

NATURAL

LTU 80/50-N7

42883510

NATURAL

LTU 90-N5

42883030

NATURAL

LTU 90/60-N7

42883530

NATURAL

LTU 100-N5

42883050

NATURAL

LTU 100/65-N7

42883550

NATURAL

LTU 110-N5

42883070

NATURAL

LTU 110/70-N7

42883570

NATURAL

LTU 120-N5

42883090

NATURAL

LTU 120/76-N7

42883590

NATURAL

LTU 125-N5

42883110

NATURAL

LTU 125/80-N7

42883610

NATURAL

LTU 130-N5

42883130

NATURAL

LTU 130/82-N7

42883630

NATURAL

LTU 140-N5

42883190

NATURAL

LTU 140/89-N7

42883650

NATURAL

LTU 150-N5

42883210

NATURAL

LTU 150/95-N7

42883670

NATURAL

LTU 160-N5

42883230

NATURAL

LTU 160/100-N7

42883690

NATURAL

LTU 175-N5

42883250

NATURAL

LTU 175/110-N7

42883710

NATURAL

LTU 180-N5

42883270

NATURAL

LTU 180/114-N7

42883730

NATURAL

LTU 200-N5

42883290

NATURAL

LTU 200/125-N7

42883750

NATURAL

LTU 225-N5

42883310

NATURAL

LTU 225/146-N7

42883770

NATURAL

LTU 250-N5

42883330

NATURAL

LTU 250/162-N7

42883790

NATURAL

LTU 80-L5

42883020

PROPANE

LTU 80/50-L7

42883520

PROPANE

LTU 90-L5

42883040

PROPANE

LTU 90/60-L7

42883540

PROPANE

LTU 100-L5

42883060

PROPANE

LTU 100/65-L7

42883560

PROPANE

LTU 110-L5

42883080

PROPANE

LTU 110/70-L7

42883580

PROPANE

LTU 120-L5

42883100

PROPANE

LTU 120/76-L7

42883600

PROPANE

LTU 125-L5

42883120

PROPANE

LTU 125/80-L7

42883620

PROPANE

LTU 130-L5

42883140

PROPANE

LTU 130/82-L7

42883640

PROPANE

LTU 140-L5

42883200

PROPANE

LTU 140/89-L7

42883660

PROPANE

LTU 150-L5

42883220

PROPANE

LTU 150/95-L7

42883680

PROPANE

LTU 160-L5

42883240

PROPANE

LTU 160/100-L7

42883700

PROPANE

LTU 175-L5

42883260

PROPANE

LTU 175/110-L7

42883720

PROPANE

LTU 180-L5

42883280

PROPANE

LTU 180/114-L7

42883740

PROPANE

LTU 200-L5

42883300

PROPANE

LTU 200/125-L7

42883760

PROPANE

LTU 225-L5

42883320

PROPANE

LTU 225/146-L7

42883780

PROPANE

LTU 250-L5

42883340

PROPANE

LTU 250/162-L7

42883800

PROPANE

-7-

B. LTU 80-250 Body Package Descriptions

(Package Part Number is indicated on the outside of each corresponding carton.)

System Lengths

Ft.

15’ Body Pkg.

42881000

5’ Body Pkg.

42882000

10’ Body Pkg.

42882020

10’ Body Pkg.

42882030

Qty.

30’

40’

50’ *

50’ **

* for LTU 180-200 Models Only; ** for LTU 225-250 Models Only

LTU Body Package Components

15’ Pkg.

42881000

5’ Pkg.

42882000

10’ Pkg.

42882020

10’ Pkg.

42882030

Part #

Component Description

Qty.

42914000

Pre-assembled 15’ ALC Steel U-Tube

(two 12-radial hole flanges) with reflector

42915000

Pre-assembled 5’ ALC Steel Tube

(two 12-radial hole flanges) with reflector

42915020

Pre-assembled 10’ ALC Steel Tube

(12-radial hole flanges) with reflector

42915030

Pre-assembled with reflector, one 10’ ATC Steel

Tube (6-hole flanges) and one 10’ ALC Steel Tube

(12-radial hole flanges)

42895000

Control End Reflector

42896000

Foot End Reflector

42907020

Body Fastener Kit, Containing:

#02167010, ¼-20 Locknuts (QTY = 12)

#02259000, ¼-20 Machine Screws (QTY = 12)

#02125130, #10-24x1/2” Screws (QTY = 4

#02189020, #10-16x1/2” Screws (QTY = 2)

#02266010, Speed Clips (QTY = 2)

#42769010, Sliding Clamps (QTY = 4)

#42921000, Tube Flange Gaskets (QTY = 2)

42907030

Body Fastener Kit, Containing:

#02125130, #10-24x1/2” Screws (QTY = 6

#02189020, #10-16x1/2” Screws (QTY = 2)

#02266010, Speed Clips (QTY = 20)

#42769010, Sliding Clamps (QTY = 6)

-8-

8.0) LTU SERIES TYPICAL LAYOUTS

EMITTER

LENGTH

MODEL

30’

LTU 80, 90, 100, 110, 120, 125, 130

40’

LTU 125, 130, 140, 150, 160, 175

50’

LTU 180, 200, 225, 250

NOTES:

1. In all configurations, the control unit must be connected directly to either a) the 12-radial hole flange of the

aluminized steel body section (for LTU 80-200 models) or b) the 6-hole flange of the 10 ft. alumi-therm steel

body section (for LTU 225 and 250 models).

2. Failure to attach the control box to the 6-hole flange for LTU 225-250 as indicated above will void the

manufacturer’s warranty.

8.1) LTU SERIES DIMENSIONS

Models: LTU 80-130

-9-

Models: LTU 125-175

Models: LTU 180-250

-10-

8.2) LTU 80-175 SERIES HEATER ASSEMBLY OVERVIEW

-11-

8.3) LTU 180-250 SERIES HEATER ASSEMBLY OVERVIEW

Models: LTU 180-200

Models: LTU 225-250

8.4) LTU SERIES 15’ BODY PACKAGE OPENING

Follow the procedure below to open the 15’ body package.

1. Remove end reflectors from packaging.

2. Lift the tube at the flange end, then slide tube support/hanger bracket between marks on tubes and tighten

the “U” bolt hex nuts. Follow instructions in Sections 8.5) and 8.6) for the field assembly of the heater.

-12-

8.5) LTU 80-130 SERIES HEATER ASSEMBLY

During field assembly of the heater, the recommended procedure is as follows:

1. Install the suspension (according to Section 8.1) using proper suspension method (see Section 5.0).

Trapeze Method

Individual Suspension Method

2. Lift the body section and suspend it into place. When lifting, caution should be used to avoid damaging the

assembly. Make sure that the long axis of heater is level.

-13-

3. Assembly the reflectors onto the body section. Leave 3” space between the tube flange and the first

reflector for later mounting of control box and draft inducer.

4. Place the flanges of the control end reflector flush with the end of the first reflector. Secure by sliding speed

clips onto reflector edges. Evenly space 6 speed clips on sides and top of reflectors to provide a snug fit.

Place foot end reflector on the opposite end of the reflector and secure as above.

5. Attach the control box to the right-hand control tube flange and secure with 1/4-20 locknuts. The control box

must be mounted with the perforated fresh air plate on top, facing the ceiling.

6. Attach the draft inducer assembly to the left-hand draft inducer tube flange and secure with 1/4-20 locknuts.

A flue restrictor plate is attached to the draft inducer weld studs. DO NOT DISCARD RESTRICTOR PLATE and

make sure this remains in place while the draft inducer is being attached to the heater body.

-14-

7. Insert SJO cable through the strain relief bushing of the control box and connect to L1 and L2 of terminal

block. Refer also to the wiring diagram in Section16.0).

8. Reflectors should overlap 1” to 3” and must be secured by sliding speed clips on the reflector edges. One

speed clip is required for each side of the reflector.

9. Fasten the first reflector to the tube support/hanger bracket with (2) #10 sheet metal screws according to

Detail “A”. Mount the sliding reflector clamps (#42769010) per Reflector Clamp Installation (Detail “B”) on

all tube support/hanger brackets. Make sure the reflector can slide under the clamp during heater operation.

The reflector clamps MUST be installed per reflector clamp

installation detail which allows the reflector to slide under the

clamp during heater operation.

Do not relocate the tube support/hanger bracket at the control box end of

the heater. This will increase the weight on the emitter tube and can result

in premature tube failure; this will void manufacturer’s warranty.

-15-

8.6) LTU 125-250 SERIES – JOINING OF 5’ AND 10’ BODY SECTIONS

These models require the use of an additional 5’ body section for LTU 125-175 and 10’ body section for LTU 180-

250, as shown in Section 8.1). Follow the instruction below for joining these sections.

1. Join the tube flanges of the body sections together with gaskets in between. Secure the flanges with the ¼-

20 screws and locknuts provided.

2. Assemble the control box, draft inducer, and other components as previously described in the heater

assembly instructions.

-16-

9.0) LTS SERIES SPECIFICATIONS

Model

No.

Btu/hr

High

Input

(2-Stage)

Btu/hr

Low

Input

Flue Restrictor

Plate

I.D. & Part #

Orifice Size

Minimum *

Mounting Height

Natural Gas

Propane Gas

Horizontal

45º Angle

LTS 40

40,000

25.000

1”

42741040

#31

(0.120)

#49

(0.073)

10 ft.

9 ft.

LTS 50

50,000

31,500

1-1/8”

42741030

3.3mm

(0.130)

#46

(0.081)

11 ft.

10 ft.

LTS 60

60,000

38,000

1-7/32”

42741020

#27

(0.144)

#43

(0.089)

12 ft.

11 ft.

LTS 75

75,000

50,000

1-7/16”

42741010

#20

(0.161)

#39

(0.099)

13 ft.

12 ft.

LTS 80

80,000

50,500

1-1/2”

42741050

#19

(0.166)

#38

(0.102)

13 ft.

12 ft.

LTS 90

90,000

57,000

1-1/2”

42741050

#16

(0.177)

#36

(0.106)

13 ft.

12 ft.

LTS 100

100,000

63,000

1-5/8”

42741060

#14

(0.182)

#33

(0.113)

13 ft.

12 ft.

LTS 110

110,000

69,500

1-3/4”

42741070

#10

(0.194)

#31

(0.120)

14 ft.

13 ft.

LTS 120

120,000

76,000

1-3/4”

42741070

13/64

(0.203)

1/8

(0.125)

14 ft.

13 ft.

LTS 125

125,000

80,000

1-7/8”

42741080

(0.206)

#30

(0.129)

14 ft.

13 ft.

LTS 130

130,000

82,000

1-7/8”

42741080

(0.209)

3.3mm

(0.130)

14 ft.

13 ft.

LTS 140

140,000

88,500

2-1/32”

42741090

5.5mm

(0.216)

#29

(0.136)

15 ft.

14 ft.

LTS 150

150,000

95,000

2-1/32”

42741090

5.7mm

(0.224)

#28

(0.140)

15 ft.

14 ft.

LTS 160

160,000

100,000

2-1/4”

42741100

5.8mm

(0.228)

#27

(0.144)

15 ft.

14 ft.

LTS 175

175,000

110,000

2-1/4”

42741100

“C”

(0.242)

3.8mm

(0.150)

15 ft.

14 ft.

LTS 180

180,000

114,000

2-1/4”

42741100

“C”

(0.242)

#24

(0.152)

18 ft.

17 ft.

LTS 200

200,000

125,000

2-3/8”

42741130

“F”

(0.257)

#21

(0.159)

18 ft.

17 ft.

LTS 225

225,000

146,000

2-1/2”

42741140

6.9mm

(0.272)

#18

(0.170)

20 ft.

19 ft.

LTS 250**

250,000

162,000

2-3/4”

42741150

“K”

(0.281)

4.5mm

(0.177)

20 ft.

19 ft.

* MOUNT HEATERS AS HIGH AS POSSIBLE. Minimums are shown as a guideline for human comfort and uniform

energy distribution for complete building heating applications. Consult your Space-Ray representative for the

particulars of your installation requirements.

**LTS250-50 Unvented Use only.

Model Identification:

Control Option

Suffix

Gas Type

Description

Natural

Single Stage Gas Valve – Single Stage Input

Propane

Single Stage Gas Valve – Single Stage Input

Natural

Two Stage Gas Valve – Modulating Input – High/Low Fire

Propane

Two Stage Gas Valve – Modulating Input – High/Low Fire

Type

Gas

Gas Pipe

Connection1

Tube

Diameter

Flue

Connection2

Fresh Air

Connection

Electrical

Supply

Current

Rating

Natural

or Propane

½” MPT

(Male)

4”

4” Round

6” Round

120 Volt, 60Hz,

1 Phase

2.6 Amp

1 LTS 225 and 250 require a minimum 3/4” nominal ID flexible gas connector.

2 LTS 180-250: 6” round. See Section 17.0) for vent sizes and limitations.

Fuse Rating:

Ignition System (direct spark):

Spark Module: 2 Amp 250V

(for 24V Circuit)

Input Power-Control: 18-30VAC 60 Hz (class 2

transformer)

30 second pre-purge period

21 second trial for ignition period

Flame Sensitivity: 0.7 uA (microamps) minimum

-17-

10.0) LTS SERIES PACKING LIST

C. Control/Draft Inducer Package

Part Description QTY

Control Box Assembly .............................................................................................................................. 1

Draft Inducer & Junction Box Assembly ................................................................................................ 1

Flue Restrictor Plate (See Section 8.6) for plate I.D. and part no.) ................................................... 1

4” x 6” Starting Collar1 (#42892009) Supplied with LTS 180-250 ................................................. 1

Control Fastener Kit (#42907010) ....................................................................................................... 1

Containing: #8-32 Screws & Nuts (#02166010 & #02127030) .......................................... 2

¼ - 20 Locknuts (#02167010) .............................................................................. 6

Tube Flange Gasket (#42921000) ...................................................................................................... 2

Installation & Operation Instructions (#43155010) .......................................................................... 1

Gas connector, 5/8” OD x 36” (#30302360) 2 ................................................................................... 1

1 4-inch Starting Collar (#40504020) supplied with LTS 40-175 models.

2 LTS 225 and 250 models using Gas Connector, 1” OD x 36” (#30302361)

LTS SERIES CONTROL/DRAFT INDUCER PACKAGE NUMBERS

1-STAGE CONTROLS

2-STAGE CONTROLS

MODEL NO.

PART NO.

GAS TYPE

MODEL NO.

PART NO.

GAS TYPE

LTS 40-N5

43187010

NATURAL

LTS 40-N7

43187510

NATURAL

LTS 50-N5

43187030

NATURAL

LTS 50-N7

43187530

NATURAL

LTS 60-N5

43187050

NATURAL

LTS 60-N7

43187550

NATURAL

LTS 75-N5

43187070

NATURAL

LTS 75-N7

43187570

NATURAL

LTS 40-L5

43187020

PROPANE

LTS 40-L7

43187520

PROPANE

LTS 50-L5

43187040

PROPANE

LTS 50-L7

43187540

PROPANE

LTS 60-L5

43187060

PROPANE

LTS 60-L7

43187560

PROPANE

LTS 75-L5

43187080

PROPANE

LTS 75-L7

43187580

PROPANE

LTS 80-N5

42883010

NATURAL

LTS 80/50-N7

42883510

NATURAL

LTS 90-N5

42883030

NATURAL

LTS 90/60-N7

42883530

NATURAL

LTS 100-N5

42883050

NATURAL

LTS 100/65-N7

42883550

NATURAL

LTS 110-N5

42883070

NATURAL

LTS 110/70-N7

42883570

NATURAL

LTS 120-N5

42883090

NATURAL

LTS 120/76-N7

42883590

NATURAL

LTS 125-N5

42883110

NATURAL

LTS 125/80-N7

42883610

NATURAL

LTS 130-N5

42883130

NATURAL

LTS 130/82-N7

42883630

NATURAL

LTS 140-N5

42883190

NATURAL

LTS 140/89-N7

42883650

NATURAL

LTS 150-N5

42883210

NATURAL

LTS 150/95-N7

42883670

NATURAL

LTS 160-N5

42883230

NATURAL

LTS 160/100-N7

42883690

NATURAL

LTS 175-N5

42883250

NATURAL

LTS 175/110-N7

42883710

NATURAL

LTS 180-N5

42883270

NATURAL

LTS 180/114-N7

42883730

NATURAL

LTS 200-N5

42883290

NATURAL

LTS 200/125-N7

42883750

NATURAL

LTS 225-N5

42883310

NATURAL

LTS 225/146-N7

42883770

NATURAL

LTS 250-N5

42883330

NATURAL

LTS 250/162-N7

42883790

NATURAL

LTS 80-L5

42883020

PROPANE

LTS 80/50-L7

42883520

PROPANE

LTS 90-L5

42883040

PROPANE

LTS 90/60-L7

42883540

PROPANE

LTS 100-L5

42883060

PROPANE

LTS 100/65-L7

42883560

PROPANE

LTS 110-L5

42883080

PROPANE

LTS 110/70-L7

42883580

PROPANE

LTS 120-L5

42883100

PROPANE

LTS 120/76-L7

42883600

PROPANE

LTS 125-L5

42883120

PROPANE

LTS 125/80-L7

42883620

PROPANE

LTS 130-L5

42883140

PROPANE

LTS 130/82-L7

42883640

PROPANE

LTS 140-L5

42883200

PROPANE

LTS 140/89-L7

42883660

PROPANE

LTS 150-L5

42883220

PROPANE

LTS 150/95-L7

42883680

PROPANE

LTS 160-L5

42883240

PROPANE

LTS 160/100-L7

42883700

PROPANE

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